Apparatus for making stannic oxid.



No. 880,873. PATENTED MAR. 3, 1908. H. FOERSTERLING.

APPARATUS FOR MAKING STANNIO OXID.

APPLICATION FILED FEB.23,1905.

2 SHEETSSHEET l.

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H. FOERSTERLING.

APPARATUS FOR MAKING STANNIG OXID.

APPLICATION FILED FEB. 23, 1905.

2 SHEETSSHEET 2 UNITED STATES PATENT OFFICE;

HANS FOERSTERLING, OF PERTH AMBOY, NEW JERSEY, ASSIGNOR TO THE ROESSLER & HASSLACHER CHEMICAL 00., OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

' APPARATUS FOR MAKING STANNIG OXID.

Patented March 3, 1908.

Application filed February 23. 1905. Serial No. 246.894.

To all whom it may concern:

Be it known that I, HANS FOERSTERLING, a citizen'of the United States, residing at Perth Amboy, in the State of New Jersey, have invented a new and useful Apparatus for Making Stannic Oxid, of which the following is a specification.

The object of this invention is to provide an improved apparatus for the process of making stannic oxid.

The invention particularly relates to the apparatus used for carryin on the continuous process described and c aimed in Letters Patent, No. 780,984, granted to me, January 31,1905,

This application for patent, shows, describes and claims practically the'same aparatus with such improvements thereon as I liave found to be of advantage in practice.

The apparatus comprises a melting pan arranged in a combustion furnace. This melting pan is made comparatively shallow and the metallic tin is supplied thereto. Means are provided for causing combustion to melt metallic tin therein preferably by causing flame, such as that of burning gas, to play over the surface of the metallic tin in the melting pan. Means are also provided whereby a supply of air is heated and led into contact with the melted tin. The air is heated previous tocontacting with said tin, to a temperature such that the contacting air and tin will be above that at which the lower dark colored oxid known as stannous oxid is formed. The air is first preferably heated in the furnace as hot as it can conveniently be, say up to 400 or 500 degrees centigrade and is then brought up to the specified temperature which is from 900 to 1100 degrees centigrade byits passa e throu h said flame before it contacts with t e meta lic tin. The stannic oxid thus formed is removed and fresh metallic tin is supplied as the bath is depleted.

The apparatus and the detailed improvements thereon can be understood from the accompanying two sheets of drawings re ferring to which,

Figure 1 is a sectional elevation thereof. Fig. 2 is a sectional lan view taken on the line 22 of Fig. 1. ig. 3 is a cross-sectional elevation taken on the line 33 of Fig. 1.

Fig. 4 is a sectional plan view taken just in and, Fig. 6 is a sectional plan view of one of the burners.

Referring to the drawings and in detail A designates a suitable furnace which has a shallow melting pan B formed therein. A door A is formed in the side of the furnace through which the tin may be supplied and through which the tin oxid may be removed. At the rear of the furnace are arranged a series of chambers C, C, and C". The first chamber is. connected with the space in the furnace inclosing the melting pan by an opening 10. The first chamber is connected with the second chamber by an opening 11, the

second chamber is connected with the third chamber by an opening 12, and the third chamber connects with a suitable flue 13. The openings 10, 11, 12 and the fine 13 are arranged alternately at the top and bottom of the chambers, as shown, so that the products of combustion will follow the course through said chambers indicated by arrows. An air pipe line 14, connected to a suitable source of air supply as an air pump or blower, is connected to the third chamber C and said pipe is provided with a suitable valve 140 for controlling the ingress of air. The pipe line is carried down and up, transversely across the chamber C as shown at 15 in Fig. 3 and then connects with thesecond chamber C where it is similarly carried down and up as at 16, and then connects with the first chamber whereit is carried similarly down and up transversely as at 17. The pipe line then connects with a drum or large pipe 18 at the rear. of the space inclosing the meltin pan. The drum 18 connects by a number 0 suitable pi es 19, four being shown, to a drum or a arge. ipe 20 at. the front of the furnace. It will e noticed that the pipes 19 extendover the melting pan. The drum 20 connects by pipe 21 to a large pipe or drum 22 arranged above the same.

Extending out from the drum 20 are pipes 23 which connect to the burners, D four of such pipes being shown as connecting to four burners. These pipes 23 are provided with suitable valves 230 as shown. Gas pi 24 are brought up to connect also wit said burners and said gas pipes are provided with suitable valves 240. I v

The construction of one of the burners D is shown in Figs. 5 and 6. Each burner 0011-.

The

box is provided with a partition 25 from which to the rear wall extends a series of short pipes 26, nine being shown. The gas pipe 24 connects to said box between said partition and the rear wall.

The rear wall is provided with a series of X-shaped openings 260 arranged between the ends of the pipes 26 through which the gas can issue and as it issues, it is thoroughly mixed with the air coming out through the pipes 26, whereby an extremely, hot sheet of flame is produced, the combustion taking place some little distance out from the burners. The gas and airfpassing to each burner can be regulated by the valves 230 and 240. By using a series of these burners side by side, an extremely hot sheet of flame can be caused to play over'the melting pan.

The ends of the drum 20 are connected with openings 2727 which extend verticallydown through sidewalls of the furnace and which unite in an opening 28 extending tween the same and the front edge to. the melting pan. The flow of air down through the vertical openings 2727 may be con-- ture, 900 to 1100 degrees centigrade,,so that when it contacts with the tin, stannic oxid will be formed. I

In operation, the furnace is first brought to a veryhigh temperature, then the initial char e of tin is melted and compressed air is supp ied to the pipe line so as to act as above described. As the stannic oxid is formed, it is removed by ,an operator with a rake through the door and as the bath is depleted, fresh tin is supplied.

The chambers C, C, and C are provided with doors through which any dust or oxid carried over the products of combustion can be removed.

, By this apparatus, the continuous process of making stannic oxid can be carried on commercially with high'eificiency.

The details and arrangements herein shown and described may be greatly varied by a skilled mechanic without departing from the scope of my invention as expressed in the clalms.

Having fully described my invention, what I desire to secure by Letters Patent of the United States is 1. Afurnace for making stannic oxid comprising a meltingpan, means for directing flames into said melting pan whereby tin y this arrangement, the air will be heated to the proper tempera- I b may be melted therein, and means for heating air and leading the same directly up into the flames from below at substantially rightflames horizontally over the pan, and means for introducing air directly u ward into the flame before it contacts with t I e t'inQ 4. A furnace comprising a melting pan, means for directing a wide horizontal flame of burning gas over the melting pan, means for initially heating air, and means for introductransversely between the side walls of the furnace in front of the burners D and berest of said air directly under and into the- 6. A furnace formaking stannic oxid,comprising a melting pan, .means for directing urning gas over said melting pan, chambers beyond said an and connected to each other and the me ting chamber, air pipes in said chambers for utilizing the heat in said chambers for initially heating air, means for mixing part of the heated air with the gas, and means for directing the restof the heated air into the flame before it contacts with the metal.

7. A furnace comprising a melting pan, means fordirecting burning gas over said meltin pan, a series of connected chambers beyon said pan and connected to the exit end of the melting chamber, a pipe extend-- ing transversely in each of said chambers, and means connected to this pipe for directing the air heated in saidpipe line into the flame before it contacts with the metal.

8. A furnace comprising a melting pan, means for directing burning gas over said pan, a series of connected chambers beyond said pan, a pi e line extending successively through said cliambers and over the melting pan, and means for leading air heated therein into contact with the melted metal.

9. A furnace, com rising a melting pan, means for directing extending throug saidcha'mbers and over urmng gas over said pan, chambers be 0nd said pan, a pipe line the melting pan, and means for leading the 3 air heated therein down at.- the side of the furnace and then up into the flame.

10. A furnace, com rising a melting pan, burners for directing burning gas over said pan, a gipe line in said furnace for heating air, ant connections to said pipe line arranged so that )art of the air heated therein will be directed to mix with the gas before. combustion, and so that the rest of said air will be introduced directly under and into the flame before it contacts with the metal.

11. 'A furnace, comprising a melting pan, a series of gas burners arranged in front of said pan for directing burning gas thereover, chambers at the rear of said pan, a pipe line extending from said chambers and ovensaid melting pan, means for directing part of the heated air to said burners, and regulable means for directing the rest of said heated air to mix into the flame from the underside before it contacts with the metal.

12. A furnace of the class described, consisting of a furnace structure having a melting pan, a burner inits front wall arranged to direct its flames into said meltin pan, a transverse chamber formed in the urnace structure and opening into the combustion chamber between the melting pan and the burner and under the flames, vertical air passages in the furnace structure connected to said transverse passa e, a transverse heating drum in the com ustion chamber and connected at its ends to said vertical air passages, a pipe line extendin forward over the melting pan and connected to said transverse heating drum, valved pipes leading from said heating drum to the burner, and means for supplying fuel to the burner, substantially as set forth.

13. A furnace comprising a melting pan, a burner constructed to project flames into the melting pan, means for conductin a supply of air into said flame, and means or leadin apart of said supply of air directly upwan into the flames at a point between the burner and the melting pan.

14. A furnace com rising a melting pan, a burner for directing fiames into the melting pan, and means for leading a supply of air upward into the flames, said means consisting of an air chamber extending across the front walls of the furnace at a point between the burner and the melting pan and having an open top under the ath of said flame.

15. In a furnace, t e combination of a meltlng pan, a series of chambers at one end of said melting pan through which the products of combustion are adapted to pass, said chambers opening into each other and their openings being in staggered relation with each other, a burner located at the discharge end of the melting pan, means for feeding a fluid fuel to said burner, a pipe connected with a source of compressed air passing in turn through each of said chambers and over the top of the melting pan and through the front wall of the furnace, said pipe passing outside the furnace and into said burner, and having means outside the furnace whereby the flow of air to the pipe may be regulated.

16; In a furnace, the combination of a melting pan, a series of chambers at one end of said melting pan through which the products of combustion are adapted to pass, said chambers opening into each other and their openings being in staggered relation with each other, a burner located at the discharge end of the melting pan, means for feeding a fluid fuel to said burner, a pipe connected with the source of compressed air passing in turn through each of said chambers and over the top of the melting pan and through the front wall of the furnace, said pipe passing outside the furnace and into said burner, and having means outside the furnace whereby the flow of air to the pipe may be regulated, the furnace having a passage in its front side under the flame from the burner, means for conducting a part of the air from said pipe into said passage, and means for conducting the air from said passage into the flame before it strikes the metal.

17. In a furnace, the combination of a melting pan, a burner at one end thereof, a pipe for conducting air above said melting pan, whereby the air may be. heated, said pipe extending out of the furnace and into the burner, said furnace having a assage below the front end thereof, means or conducting part of the air from said pipe into said passage, means for conducting air from said passage into the flame before it strikes the burner, and means for regulating the last named conducting means.

In testimony whereof l have hereunto set my hand, in the presence of two subscribing witnesses.

HANS FOERSTERLING.

Witnesses:

EMIL Klaus, L. M. Rossr. 

